;
(function (root, factory) {
	if (typeof define === 'function' && define.amd) {
		define(factory);
	} else if (typeof exports === 'object') {
		module.exports = factory();
	} else {
		root.NProgress = factory();
	}

})(this, function () {
	var NProgress = {};

	NProgress.version = '0.2.0';

	var Settings = NProgress.settings = {
		minimum: 0.08,
		easing: 'ease',
		positionUsing: '',
		speed: 200,
		trickle: true,
		trickleRate: 0.02,
		trickleSpeed: 800,
		showSpinner: true,
		barSelector: '[role="bar"]',
		spinnerSelector: '[role="spinner"]',
		parent: 'body',
		template: '<div class="bar" role="bar"><div class="peg"></div></div><div class="spinner" role="spinner"><div class="spinner-icon"></div></div>'
	};

	/**
	 * Updates configuration.
	 *
	 *     NProgress.configure({
   *       minimum: 0.1
   *     });
	 */
	NProgress.configure = function (options) {
		var key, value;
		for (key in options) {
			value = options[key];
			if (value !== undefined && options.hasOwnProperty(key)) Settings[key] = value;
		}

		return this;
	};

	/**
	 * Last number.
	 */

	NProgress.status = null;

	/**
	 * Sets the progress bar status, where `n` is a number from `0.0` to `1.0`.
	 *
	 *     NProgress.set(0.4);
	 *     NProgress.set(1.0);
	 */

	NProgress.set = function (n) {
		var started = NProgress.isStarted();

		n = clamp(n, Settings.minimum, 1);
		NProgress.status = (n === 1 ? null : n);

		var progress = NProgress.render(!started),
			bar = progress.querySelector(Settings.barSelector),
			speed = Settings.speed,
			ease = Settings.easing;

		progress.offsetWidth;
		/* Repaint */

		queue(function (next) {
			// Set positionUsing if it hasn't already been set
			if (Settings.positionUsing === '') Settings.positionUsing = NProgress.getPositioningCSS();

			// Add transition
			css(bar, barPositionCSS(n, speed, ease));

			if (n === 1) {
				// Fade out
				css(progress, {
					transition: 'none',
					opacity: 1
				});
				progress.offsetWidth;
				/* Repaint */

				setTimeout(function () {
					css(progress, {
						transition: 'all ' + speed + 'ms linear',
						opacity: 0
					});
					setTimeout(function () {
						NProgress.remove();
						next();
					}, speed);
				}, speed);
			} else {
				setTimeout(next, speed);
			}
		});

		return this;
	};

	NProgress.isStarted = function () {
		return typeof NProgress.status === 'number';
	};

	/**
	 * Shows the progress bar.
	 * This is the same as setting the status to 0%, except that it doesn't go backwards.
	 *
	 *     NProgress.start();
	 *
	 */
	NProgress.start = function () {
		if (!NProgress.status) NProgress.set(0);

		var work = function () {
			setTimeout(function () {
				if (!NProgress.status) return;
				NProgress.trickle();
				work();
			}, Settings.trickleSpeed);
		};

		if (Settings.trickle) work();

		return this;
	};

	/**
	 * Hides the progress bar.
	 * This is the *sort of* the same as setting the status to 100%, with the
	 * difference being `done()` makes some placebo effect of some realistic motion.
	 *
	 *     NProgress.done();
	 *
	 * If `true` is passed, it will show the progress bar even if its hidden.
	 *
	 *     NProgress.done(true);
	 */

	NProgress.done = function (force) {
		if (!force && !NProgress.status) return this;

		return NProgress.inc(0.3 + 0.5 * Math.random()).set(1);
	};

	/**
	 * Increments by a random amount.
	 */

	NProgress.inc = function (amount) {
		var n = NProgress.status;

		if (!n) {
			return NProgress.start();
		} else {
			if (typeof amount !== 'number') {
				amount = (1 - n) * clamp(Math.random() * n, 0.1, 0.95);
			}

			n = clamp(n + amount, 0, 0.994);
			return NProgress.set(n);
		}
	};

	NProgress.trickle = function () {
		return NProgress.inc(Math.random() * Settings.trickleRate);
	};

	/**
	 * Waits for all supplied jQuery promises and
	 * increases the progress as the promises resolve.
	 *
	 * @param $promise jQUery Promise
	 */
	(function () {
		var initial = 0, current = 0;

		NProgress.promise = function ($promise) {
			if (!$promise || $promise.state() === "resolved") {
				return this;
			}

			if (current === 0) {
				NProgress.start();
			}

			initial++;
			current++;

			$promise.always(function () {
				current--;
				if (current === 0) {
					initial = 0;
					NProgress.done();
				} else {
					NProgress.set((initial - current) / initial);
				}
			});

			return this;
		};

	})();

	/**
	 * (Internal) renders the progress bar markup based on the `template`
	 * setting.
	 */

	NProgress.render = function (fromStart) {
		if (NProgress.isRendered()) return document.getElementById('nprogress');

		addClass(document.documentElement, 'nprogress-busy');

		var progress = document.createElement('div');
		progress.id = 'nprogress';
		progress.innerHTML = Settings.template;

		var bar = progress.querySelector(Settings.barSelector),
			perc = fromStart ? '-100' : toBarPerc(NProgress.status || 0),
			parent = document.querySelector(Settings.parent),
			spinner;

		css(bar, {
			transition: 'all 0 linear',
			transform: 'translate3d(' + perc + '%,0,0)'
		});

		if (!Settings.showSpinner) {
			spinner = progress.querySelector(Settings.spinnerSelector);
			spinner && removeElement(spinner);
		}

		if (parent != document.body) {
			addClass(parent, 'nprogress-custom-parent');
		}

		parent.appendChild(progress);
		return progress;
	};

	/**
	 * Removes the element. Opposite of render().
	 */

	NProgress.remove = function () {
		removeClass(document.documentElement, 'nprogress-busy');
		removeClass(document.querySelector(Settings.parent), 'nprogress-custom-parent');
		var progress = document.getElementById('nprogress');
		progress && removeElement(progress);
	};

	/**
	 * Checks if the progress bar is rendered.
	 */

	NProgress.isRendered = function () {
		return !!document.getElementById('nprogress');
	};

	/**
	 * Determine which positioning CSS rule to use.
	 */

	NProgress.getPositioningCSS = function () {
		// Sniff on document.body.style
		var bodyStyle = document.body.style;

		// Sniff prefixes
		var vendorPrefix = ('WebkitTransform' in bodyStyle) ? 'Webkit' :
			('MozTransform' in bodyStyle) ? 'Moz' :
				('msTransform' in bodyStyle) ? 'ms' :
					('OTransform' in bodyStyle) ? 'O' : '';

		if (vendorPrefix + 'Perspective' in bodyStyle) {
			// Modern browsers with 3D support, e.g. Webkit, IE10
			return 'translate3d';
		} else if (vendorPrefix + 'Transform' in bodyStyle) {
			// Browsers without 3D support, e.g. IE9
			return 'translate';
		} else {
			// Browsers without translate() support, e.g. IE7-8
			return 'margin';
		}
	};

	/**
	 * Helpers
	 */

	function clamp(n, min, max) {
		if (n < min) return min;
		if (n > max) return max;
		return n;
	}

	/**
	 * (Internal) converts a percentage (`0..1`) to a bar translateX
	 * percentage (`-100%..0%`).
	 */

	function toBarPerc(n) {
		return (-1 + n) * 100;
	}


	/**
	 * (Internal) returns the correct CSS for changing the bar's
	 * position given an n percentage, and speed and ease from Settings
	 */

	function barPositionCSS(n, speed, ease) {
		var barCSS;

		if (Settings.positionUsing === 'translate3d') {
			barCSS = {transform: 'translate3d(' + toBarPerc(n) + '%,0,0)'};
		} else if (Settings.positionUsing === 'translate') {
			barCSS = {transform: 'translate(' + toBarPerc(n) + '%,0)'};
		} else {
			barCSS = {'margin-left': toBarPerc(n) + '%'};
		}

		barCSS.transition = 'all ' + speed + 'ms ' + ease;

		return barCSS;
	}

	/**
	 * (Internal) Queues a function to be executed.
	 */

	var queue = (function () {
		var pending = [];

		function next() {
			var fn = pending.shift();
			if (fn) {
				fn(next);
			}
		}

		return function (fn) {
			pending.push(fn);
			if (pending.length == 1) next();
		};
	})();

	/**
	 * (Internal) Applies css properties to an element, similar to the jQuery
	 * css method.
	 *
	 * While this helper does assist with vendor prefixed property names, it
	 * does not perform any manipulation of values prior to setting styles.
	 */

	var css = (function () {
		var cssPrefixes = ['Webkit', 'O', 'Moz', 'ms'],
			cssProps = {};

		function camelCase(string) {
			return string.replace(/^-ms-/, 'ms-').replace(/-([\da-z])/gi, function (match, letter) {
				return letter.toUpperCase();
			});
		}

		function getVendorProp(name) {
			var style = document.body.style;
			if (name in style) return name;

			var i = cssPrefixes.length,
				capName = name.charAt(0).toUpperCase() + name.slice(1),
				vendorName;
			while (i--) {
				vendorName = cssPrefixes[i] + capName;
				if (vendorName in style) return vendorName;
			}

			return name;
		}

		function getStyleProp(name) {
			name = camelCase(name);
			return cssProps[name] || (cssProps[name] = getVendorProp(name));
		}

		function applyCss(element, prop, value) {
			prop = getStyleProp(prop);
			element.style[prop] = value;
		}

		return function (element, properties) {
			var args = arguments,
				prop,
				value;

			if (args.length == 2) {
				for (prop in properties) {
					value = properties[prop];
					if (value !== undefined && properties.hasOwnProperty(prop)) applyCss(element, prop, value);
				}
			} else {
				applyCss(element, args[1], args[2]);
			}
		}
	})();

	/**
	 * (Internal) Determines if an element or space separated list of class names contains a class name.
	 */

	function hasClass(element, name) {
		var list = typeof element == 'string' ? element : classList(element);
		return list.indexOf(' ' + name + ' ') >= 0;
	}

	/**
	 * (Internal) Adds a class to an element.
	 */

	function addClass(element, name) {
		var oldList = classList(element),
			newList = oldList + name;

		if (hasClass(oldList, name)) return;

		// Trim the opening space.
		element.className = newList.substring(1);
	}

	/**
	 * (Internal) Removes a class from an element.
	 */

	function removeClass(element, name) {
		var oldList = classList(element),
			newList;

		if (!hasClass(element, name)) return;

		// Replace the class name.
		newList = oldList.replace(' ' + name + ' ', ' ');

		// Trim the opening and closing spaces.
		element.className = newList.substring(1, newList.length - 1);
	}

	/**
	 * (Internal) Gets a space separated list of the class names on the element.
	 * The list is wrapped with a single space on each end to facilitate finding
	 * matches within the list.
	 */

	function classList(element) {
		return (' ' + (element.className || '') + ' ').replace(/\s+/gi, ' ');
	}

	/**
	 * (Internal) Removes an element from the DOM.
	 */

	function removeElement(element) {
		element && element.parentNode && element.parentNode.removeChild(element);
	}

	return NProgress;
});
